Engraving-machine.



J. F. KELLER & W. A. WARMAN.

ENGRAVING MACHINE.

APPLICATION FILED SEPT. 1. I915.

Patented Oct. 16, 1917.

5 SHEETS-SHEET I.

J. F. KELLER & W. A. WARMAN.

ENGRAVING MACHINE.

APPLICATION FILED SEPT. r. 1915.

Patented Oct. 16, 1917.

5 SHEETS-SHEET 2.

3. F. KELLER & W. A. WARMAN.

ENGRAVING MACHINE. APPLICATION men SEPT. 1. nus.

5 SHEETS-SHEET 3- Patented Oct. 16, 1917.

1. F. KELLER & W. A. WARMAN.

ENGRAVING MACHINE. APPLICATION FILED SEPT. 1. 1915.

5 SHEETS-SHEET 4- Patented Oct. 16, 1917.

I. F. KELLER & W. A. WARMAN. ENGRAVING MACHINE.

APPLICATION FILED SEPT. 1. I915- 1,243,182. Patented Oct. 16,1917.

5 SHEETS-SHEET 5.

w aumhw gamma State of UNITED STATES PATENT OFFICE.

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Specification of Letters Patent.

Patented Oct. 16, 1917.

Application fled mtember 7, 1915. lei-la! llo. 48,418.

To all whom it may concern:

Be it known that we, JosErH F. Km: and,W1Lmim A. Warmer, both citizens of the United States, and both residents of New York in the county of New York and New York, have invented certain new and useful Im rovements in Engraving-Machines, of w ich the following is a specification.

Our invention relates to automatic enaving machines of the type or class wherem a die or mold is produced from a model or pattern, and in which a tracer carried by a pivotally sup orted swinging frame contacts with and ollows the contour of a moving pattern, while a revolving cutter also carried by said swinging frame reproduces the pattern in a m block of steel or other suitable material, t us forming a die or mold corresponding with the ggttern the motion of the pattern and die ing of such a character that every part of the surface of the pattern is brou ht into contact with the tracer, and every eature or detail of such surface is re roduced in the die; the tracer being enable to follow the contour of the pattern because of its being supported in a swinging frame, as stated, and the pattern and die being carried by and secured to a suitable moving table or tables, as will hereinafter more fully appear.

Such engraving machines are commonly known and referred to as Eantographic machines because of the fact t at the movement of one element, the cutter, is controlled by the movement of another, the tracer; and our invention as the same is disclosed and claimed in this application is in the nature of an improvement in the en aving machine covered by our prior atent, No. 956,769, dated May 3, 1910, for machine for engraving or sinking dies; the object of our present invention being to provide various im rovements in the engraving machine to which said patent relates whereby the convenience of manipulation, the range of operation and of use, and the efliciency and general utility of said prior machine, are en hanced.

With the above and other objects of invention in View, our invention consists in the improved en aving machine and subordinate and auxi iary features thereof illus- .ing machine whereby a modified m in the accompanying drawings and hereinafter described and claimed, and in such variations and modifications thereof as will be obvious to those skilled in the art to which our invention relates.

In the drawin accompanying and form ing a part of this application and wherein operation is secured;

Fig. 4 is a view showin details of construction of a clutch mem r employed in our machine;

Fig. 5 is a view showing a detail of mechanism whereby our machine may be manually operated, the same being taken upon a horizontal plane indicated by the line 55,

ig. 6 is a view showin the feed mechanism for the swingin rame supporting slide enlarged, and in etail;

Fig. 7 is a view taken upon a transverse plane indicated by the line 7-7, Fig. 6, looking toward the left;

Fig. 8 is a view showing certain details of construction, of a pawl or feed dog included in said feed mechanism;

Fig. 9 is a view showing details of construction of a friction drlve member for operating the feed mechanism shown in Fi s. 6 and 7;

Fig. 10 is a fragmentary view in side ele vation illustrating a mo ified arrangement of the attern and die supporting table and of the eed mechanism therefor, and a modified form of support for said tables;

Fig. 11 is a similar view showing the same in plan;

Fig. 12 is a similar view showing an end elevation of said modified form;

Fi 13 is a similar view illustrating a capa ility of arrangement of certain elements of our machine whereby a modified mode of operation may be secured;

itself% with a cutter in place therein.

. numeral 20d Re erring to the drawings, the reference ates a smtable base or pedestal which may be of any desired form so long emit serves to support the venous elements of our machine hereinafter referred to in pro r positions with reference ,to one another.

ated adjacent the upper end of the base are horizontally arranged guides 21, upon which guides a reciprocatm I supporting member or slide 22 moves; whi

slide serves as a support for a reciprocating and swingin frame 23, the connection between thes do and frame being through pivots shown at 24; from which construction it follows that said frame moves horizontally as the slide 22 moves along the guides 21, and that the free right has end of said frame may partake o a swinging movement.

The base or frame is also provlded with a second pair of guides 25, these guides being transverse with reference to the guides 21, or verticall arranged, and 26 designates a vertical y mova le table or platen the movements of which are guided by said last mentioned ides, from which it follows that the slide 22 and table 26 move in paths transverse to one another, or at right angles to one another in the embodiment of our invention illustrated. The table 26 serves as a su port for the model or pat-.

of right angle brackets 29 having set screws which engage the pattern and die as shown.

The reciprocating and swinging frame 23 carries at its free end a tracer 30 which contacts with the pattern 2?, and also a rotatin cutter 31 which cuts away the materia of the block in which the die 28 is formed' the tracer moving in contact with and following the irregularities of the pattern while the rotary cutter reproduces said pattern in the block in forming the die. When the machine is in operation the table 26 is moved u ward, the slide 22 is then moved a short istance or step to the right or left, (means being provided for moving the slide in both directions, as will hereinafter appear), to advance the cutter and tracer, and the table is then moved downward at the end of which downward movewas ment the slide is a in advanced; the ad.- vance movements 0 the slide and, consequently, of the cutter and tracer, taking place at the ends of the upward and downward movements of the ta le 26 which carries the pattern and" the die being formed.

The tracer 30 and cutter 81 are held in contact with the model and die by means of a weight 82 supported from one arm of a bell-crank lever 33 by means of a flexible cord or rope 34, said bell-crank lever being loose upon a shaft 35 sup orted in suitable bearings carried by the rame of the machine. The other arm of the lever 33 is connected with the swinging frame 23 through a flexible cord or rope 36, from which it follows that the ull of the weight 82 acts throu h the mec anism above described to hol the tracer and cutter in contact with the model and die, and causes the tracer to follow the irregularities of the surface of the model and the cutter to reproduce the model in the die. A spring 37 is interposed between the slide 22 and the swinging frame 23, see Figs. 1 and 2, and acts 1n opposition to the weight 32, thus partlally neutralizing the action of the weight. This Ispring 'acts to swing the frame 23 outwa and move the tracer and cutter away from the model and die when the weight 32 is'lifted, as will be hereinafter more fully described.

The rotating cutter 31 is carried by a rotar} carrier or quill 38, see Figs. 15 and 17, which carrier rotates within a sleeve 39 clamped and held against rotation in a bifurcated arm at the free end of the frame 23 by a bolt 40, but which sleeve, rotary carrier and cutter ma be readil removed from the machine by oosening the bolt, as will be understood. The outer end of this carrier is squared, as at 41, and 42 designates a pulley which serves to drive the cutter carrier or uill and the cutter carried thereb This pu lay) is supported upon a sleeve 3 supported y a bracket 44 carried by the frame 23, and the same is provided with a plate 45 having an opening correspondin in form with and through which the square end 41 of the cutter carrier enters. and within which 0 ening said squared end fits somewhat loose y, so as to avoid binding between the squared end and plate, as shown in Fig. 15; the pulley being thus in driving on agement with the cutter carrier and the atter being driven from the pulley, as will be understood. It will be appreclated that the construction here referred to and described permits the cutter carrier, sleeve, and cutter to be readily removed from the machine and a new cutter, or a new carrier and cutter, substituted therefor with a minimum delay or inconvenience, which is of importance as it is frequently desirable to change cutters as the work progresses and 48 having a longitudinallg sage 49, see Fig. 16, whic tric motor 46 carried by the swinging frame I 23. and the shaft 47 of which carries a sleeve extending passleeve carries a large-pulley 50 and a small pulley 51, each haying one or more grooves in toisreceive arounddriving belt. These pulleysmre, both loose upon the sleeve 48, but

.;either';;one of them may be locked to the passage sleeve so as to be driven therefrom, in which case the other pulley is free to rotate upon the sleeve; this locking being accomplished by means of a member 52 slidable in the 49 and operatively connected with a key 53, which key is slidable in a slot 54 provided in the sleeve and may be made to enter one of two key-ways 55, 56 provided in the pulleys, thus locking either one of the pulleys to the sleeve while permitting the other to rotate freely thereupon. The pulleys are held in place upon the sleeve by a collar 57 in threaded engagement therewith.

The pulleys 50, 51 drive the rotating cutter through a belt 58 passing one or more times about said pulleys, and two or more times about the pulley 42 whic drives the cutter holding member or quill 38, the belt being kept tight by means of slack adjusting pulleys 59 adjustable along a support 6Q carried by the frame 23, and about which the belt passes; from which it will be appreciated that the cutter will be driven fast from the large pulley 50, or slow from the small pulley 51, according to which of said pulleys is locked to the sleeve 48, the pulley not so locked to the sleeve running idly thereupon, as will be understood.

The vertically movable table 26 is moved up and down upon the guides 25 by means of a vertically arranged feed screw 61 supported in suitable bearings located adjacent the ends of the guides, which screw is in operative engagement with a threaded lug or nut carried by the table 26. This feed screw is driven from a vertical shaft 62 through a clutch member 63 of such a construction that the shaft and screw may be locked together so that the screw is driven through the clutch, or may be disconnected so that the screw will not be driven from the shaft, which clutch member will be described in detail hereinafter; and the shaft in question is driven by any suitable motor, such, for example, as thereversible electric motor 64 through any suitable reducing gearing its periphery such as is shown in Figs. 1 and 2 as comprising a gear 65 upon the horizontal shaft of the motor 64, a pinion 126 operated by said gear, and spiral gears within the casing 157 intermediate said pinion and the vertical shaft 62. The directlon of rotation of the armature of the motor 64 is reversed by means of a suitable reversing switch such as is shown conventionally at 66; and this switch is automatically operated to reverse the motor at the ends of the upward and downward movements of the table 26 by means of a vertically extending bar or rod 67, the lower endof which is operatively connected with said switch and the upper end of which carries two stops 68; said stops being engaged at the ends of the upward and downward movements of the table by :1. lug 69 carried by the table and having a hole through which the rod extends, whereby the direction of rotation of the feed, screw 61, and the direction of movement of the table, will be reversed each time the table arrives at the end of its movement in either direction, as will be understood.

The stops 68 are commonly made adjustable upon the upper cnd of the rod 67 in order that the extent of travel of the table may be varied and adjusted as will obviously be necessary in order to adapt the machine to operate upon patterns of different sizes, and to produce dies of different sizes, this adjustment being rovided for in the embodiment of our invention illustrated by providing a threaded engagement between the rod and thestops; and it will be appreciated that the rod fits loose in the opening referred to in the lug 69, sothat the lug may move along the rod without movin the same until one of the stops is engage as above pointed out.

The clutch member 63, see Fig.' 4, comprises a sleeve 7 O rigidly secured to the upper. end of the shaft 62 and into which the lower end of the feed screw 61 extends, and 71 is a second sleeve slidable upon but in permanent driving engagement with the feed screw through a key 72 and key way 73. The meeting ends of the two sleeves are provided with teeth 74, as shown, whereby when said teeth are in engagement the sleeve 71 will be driven from the sleeve and a screw 75 is provided for holding the sleeve 71 in a position such that the teeth will be out of enga ement when the feed screw and shaft are isconnected from one another and the table is to be manually operated.

The purpose of the clutch 63, which may be of any suitable form so long as the end in view is attained, is to permit the feed screw to be disconnected from the driving motor and the table 26 operated manually by means of a suitable hand wheel 76 at the outer end of a shaft 77, which shaft in turn is supported in bearings in a bracket 78 supported from the frame of the machineshaft being operatively connected with feed screw 61 as through a pinion 79 upon the inner end of the shaft, an idle gear 80 with which said pinion 79 engages and a ar 81 fast upon said screw an wi which e gear 80 engages. The hand wheel is preferabl loose upon the shaft 77, and is connec therewit by means of a springpressed pin 82 adapted to enter holes provided in a disk 83 fast upon the shaft, so that the wheel may be disen ged from the shaft and 'tted to remain at rest when not in use or operating the table, as will be understood. r

The horizontally movable supporting member or slide 22 1s moved along the guides 21 by means of a feed screw 84 supported in bearings 85 at the ends of the gu1des, and which screw is in threaded en: 1 n ent wlth a nut or In carried by the slide and shown in dotted ines at 86 Fig. 1. This feed screw is given a step by ste rotary or angular motion to automatica y advance the said the slide at the ends of the upward and downward movements of the table 26, as above explained, and at the time that the motor 64 is reversed, by means of clutch mechanism comprising a reciprocating clutch dog or pawl 87 which grasps a clutch ring 88 carried by a disk 89 permanently secured to the screw, the pawl having a recess 90 for receiving the clutch ring and a hardened steel plate 91 havin a notch which fits over the clutch ring an grasps the same, and which plate forms the immediate driving means for the clutch ring, the clutch ring being asped between the lower wall of the notch m the plate 91 and the upper wall of the recess 90, as best shown in Figs. 6, 7 and 8.

The clutch pawl 87 is rovided with a slot 92 at its upper end, an 93 is a threaded pin or screw extending through said slot and into an arm 94 projecting from an oscillating collar or ring 95 supported concentrically with reference to the feed screw 84 as upon a sleeve 96 extending from the bearing 85, whereby the pawl is capable of a slight oscillatory-and up and down movement with reference to the screw 93 in order that the walls of the recess 90 and notch in the steel plate 91 may properly adapt themselves to and grasp the clutch ring 88. The clutch mechanism above referred to is designed and adapted to rotate the feed screw 84 in both directions to thereb move the slide 22 and swingin frame 23 either to the right or left, this ein accomplished by providing two screws 9 98, both in threaded engagement with the arm 94 and each of which screws is provided wit an abutment 99, each abutment being kept from I turning as the screws are rotated in any way as by a pin entering a hole in the arm 94 as shown in dotted lines, Fig. 8. The clutch ncense pawl 87 is rovided with two op 'tel located re 100, one of which i s how ii in Fig. 8, and springs 101 are located in these the outer ends of which springs bear against the abutments 99. Referrin now to Fig. 7, if the screw 97 be loosens and the screw 98 be screwed in so that the abutment 99 carried by it rests against the side of the arm 94, as shown, then the spring 101 which acts against the abutment carried by said screw 98 will swing the awl 87 to the left, and, upon a downwar movement of the link 102, the awl will be moved to the right, during w "eh movement the clutch; 88 will be gras in the manner illustra and the feed screw 84 advanced a step in a clock-wise directi the feeding taking place upon a downwa movement of the link 102; while the pawl will slip along the clutch ring without sping it as the pawl is moved to the la and returned to its initial position during an upward movement of the link 102.

If new the screw 98 be loosened, and the screw 97 screwed in so that its abutment rests against the side of the arm 94, then the spring which acts against the abutment carried by said screw 97 will swing the pawl 87 to the right, and, upon an upward movement of the link 102 the pawl will be moved to the left, during which movement the clutch ring will be gras ed by the pawl and the feed screw advanc a step in a counter clock-wise direction, the feeding here taking place upon an upward movement of the link 102; while the pawl will slip along the clutch ring without glrasping it as said pawl is moved to the rig t and returned to its initial position dunng a downward movement of the link 102.

Finally, if both the screws 97, 98 be screwed inward the abutments 99 carried by the screws will act as stops to limit sidewise movement of the pawl in both directions, and said pawl will be held in a central or neutral position, under which condition of the parts in questionthe clutch ring 88 will not be grasped during either the upward or the downward movement of the link 102. The feed screw 84 will not be operated at all when the parts are'in such a position, and the feed mechanism for the feed screw in question will be entirely disconnected from the means hereinafter referred to and described whereby it is operated automatically in the normal operation of the machine.

The upper end of the link 102 is pivotally connected with a second arm 103 carried by and extending from the oscillating collar 95, and through which arm the feed mechanism is operated, as will be understood, and the lower end of said link is pivotally connected with an arm 104 of a friction disk 105; said disk being loose upon a shaft 106 pedso "111 is an adjustable stop in the form of a screw in threaded engagement with a fixed lug 112, and with which stop said abutment engages as the arm 103 swings downward, as shown in the dotted lines Fig. 7, to thereby determine the angular movement of the feed screw and regulate the feed.

It will therefore be appreciated that as the shaft 106 rotates in a counter-clockwise direction, referring to Fig. 9, the friction disk 105 will be carried in the same direction, motion being transmitted to the friction disk through the leather disks, and its arm 104 will move the link 102 bodily upward and swing the arms 103 and 94 and the clutch pawl into about the positions shown in full lines, Fig. 7, this fig re showing the positions assumed by the parts as the arm 104 arrives at a vertical position.

. As the arm 104 moves from its verticalposition toward the position shown in dotted lines, Fig. 9, the link 102 moves downward, whereupon the clutch pawl 87 grasps the clutch ring 88 and imparts a limited angula-r movement to the feed screw 84, thus advancing the slide 22 a step as hereinbefore explained. The friction disk 105 moves with the shaft 106 and the link 102 moves downward until the abutment 110 engages the stop 111, after which slipping occurs between the leather disks and the frictidn disk and no further motion is transmitted to the latter so long as the shaft 106 continues to rotate in the direction above assumed. When, however, the direction of rotation of the shaft 106 is reversed, and rotation in a clock-wise direction commences, the friction disk will be moved in a corresponding direction and the arm 104 will be moved from the dotted line into the full. line position shown in Fig. 9, which movement will be accompanied by 'an upward movement of the link 102 and by an angular movement of the feed screw 84, such movement and the step by step advance movements of the slide 22 taking place at each reversal of the motor 64, and as the shaft 106 begins to rotate in a new or reversed direction.

Secured to the free inner end of the feed screw 84 is a graduated wheel 113 having aspring pressed locking plunger 114 slidable in a recess formed in the hub thereof and which plunger ma enter a hole provided in a sprocket w eel 115 carried by and rotatable upon the hub of said aduated wheel, as shown in Fig. 6, to t ereby lock said graduated wheel and sprocket together, or, upon said locking plun er being withdrawn from the hole and 'he (1 out of the same, to disconnect the sprocket wheel from the graduated wheel. Said sprocket wheel is driven from a hand wheel 116 so ported at the outer end of a shaft 11%, which shaft is supported upon a bracket 118 extending from the frame of the machine; the inner end of said shaft carrying a gear 119 which drives a second gear 120 and a second sprocket wheel 121; the sprocket wheels 115 and 121 being connected by a sprocket chain 122, see Figs. 1, 2 and 5.

From the above it will be appreciated that when the plunger 114 is in a position to lock the sprocket wheel 115 and the graduated wheel 113 together, the feed screw 84 may be operated manually by the hand wheel 116 and the slide 22 and frame 23 moved in either direction, the feed dog or pawl 87 being placed in its middle or neutral ppsition at such times and held therein as above explained, in order that it may not interfere with the rotation of the clutch ring 88 when the feed screw is being operated by or from the hand wheel.

A pointer 123 is preferably provided, the

or adjustable stop 111, as will be understood.

It was above explained how the machine could is arranged so that the pattern and work or die supporting table 26 could be manually operated by the hand wheel 76, and it has yust been shown that the swinging frame 23 and tracer and rotary cutter carri d thereby maybe manually operated by the hand wheel 116, these two capabilities of operation being independent of one another as will be appreciated. This capability of manual operation is of great advantage in engraving machines of the type to which our invention belongs, as the operator is thereby enabled to perform a variety of milling, profiling, and similar 0 erations, to take heavy cuts upon portions 0 the work as opportunities for such cuts may occur, to rough out work reparatory to. taking finishin cuts with t e machine operating automatically, and in general to extend the range of the work which may be done upon the machine and to expedite the work hem done at such times and under such conditions as the judgment of the operator may dictate.

It is frequently desirable when the machine is being controlled manually by means of the hand-wheels 7 6 and 116 as above explained to move the cutter 31 and, as necessarily follows, the tracer 30 away from the pattern and die and, in the machine illustrated, means are provided whereby the motor 64 which is left running in the proper direction, may accom lish the end above referred to by lifting t e weight 32 and permitting the spring 37 to swing the swinging frame 23 awa and the die, thus removing the tracer and cutter therefrom, it being above explained that the spring 37 acts in opposition to the wei ht 32.

e mechanism shown whereb the motor may be madeto lift the wei ht 2 is as follows: The reference numera 124 designates a drum loose upon the shaft of the motor 64, see Fig. 2, and 125 designates a gear driven by the motor shaft through the gear 65 in the direction indicated by the arrow. Secured to the shaft which supports the gear 125 is a friction pulley 127, and 128 designates a belt extending about the frictionpulley 127 and over the drum 124 see Fig. 1, and the lower end of which belt is connected with a treadle 129. The other end of the belt 128 is connected with a cord or rope 130, the other end of which cord is in turn connected with an arm 131 operatively secured to the shaft 35 hereinbefore referred to. The shaft 35 also carries a second arm 132 the free end of which is connected with the weight 32 through a cord 133, see Figs. 1 and 2. This cord 133 is normally somewhat slack, as shown in Fig. '2, so that the normal up and down movements of the weight 32, as the frame 23 swings in and out, will not be interfered with; said cord bein drawn taut and acting to lift the weig t only when the tracer and cutter are tobe moved away from the pattern anddie.

The friction between the pulley 127 and the belt or strap 128 is normally msuflicient to cause said pulley to grasp the strap and lift the weight 32 throu h the connections above referred to. en, however, the treadle 129 is depressed by the foot of the operator the belt will be drawn into contact with the'pulleiy 127, and, said pulley being continuously riven in the proper direction by the reversible motor 64 as will be understood, the belt will be asped and a ull will be exerted through t e cord 130 w ich will oscillate the shaft 35 and lift the weight 32 through the cord 133, thus rmittmg the spring 37 to swing the oscil ating arm outward and move the tracer and cutter away from the model and die. The reversing stops 68 are moved out of the we when the machine is being operated manna l and when the mechanism last above descri ed is from the model being used, so that the motor will not be .upper end of which is connected with one arm of a lever 135, and a weight 136 suspended from the other end of said lever by a cord 137. The verticall moving table 26 is also preferably counter alanced by means of a weight 138 suspended from a lever 139, which lever is connected with said table by a cord 140, all as shown in Fig. 2 of the drawing.

While the table 26 has been-thus far referred to as in effect a single structure and is so illustrated in Figs. 1 and 2, it is commonly made in two parts which may be either secured together to thereby form a single or unitary structure, or disconnected from one another. When the parts of the table are secured together, as in Figs. 1, 2 and 13, they form in effect and move as a single structure, and the machine when in operation will reproduce the pattern in forming a die or will duplicate an existing die if such a die be used as a pattern, in the manner hereinbefore explained and as illustrated in Figs. 1 and 2. If, however, the two parts of the table be disconnected from one another and said parts be made to move simultaneously toward and from one another, as by means of the table feed mechanism illustrated in Figs. 10 to 12, which'feed mechanism is equally and in the same way applicable to and ca able of use with the form of our machine own in Figs. 1 and 2, then and in such a case when the machine is in operation the pattern and die will be reversed with reference to one another as illustrated in Fig. 3, or-will be right and left as is necessary in the case of two-part dies used in pairs; from which it follows that a right die may be produced from a left pattern, or left die used as a pattern, and vice versa.

Figs. 10 to 14 illustrate a: modified form of our invention so far as concerns the manner of supportin the table which carries the pattern and ie; and illustrate also an attachment or auxiliary device for use with the table feed screw, which attachment is capable of use also with the form of our machine shown in Figs. 1 and 2, by the use of which the two parts of the table are made to move simultaneously toward and from one another for the purpose above stated.

In these fi is provided with a curved seat 141 extending gures the frame of'the machine transverse to the path of travel of the supporting slide 22 and the center or axis of which seat, or the axis of curvature thereof, coincides with the axis of the feed screw 142 which corresponds in all respects with the feed screw 61 hereinbefore referred to. Sccured in place upon the curved seat 141 is a table support 143 which is angularly adjustable about a vertically extending axis corresponding with the axis of the feed screw 142, the support being held in place in any position it may be adjusted into by means of screws 144 extending through slots 145, and the inner ends of V which screws are in threaded engagement with the rear wall of the table support, as shown in Fig. 14.

The table support is provided with guides 146, and 147 designates the two parts of the table upon which the pattern and die are supported. These parts are provided with lugs 148 at their inner 'ends whereby they may be secured together by means of bolts 149, as shown in Fig. 13 and as is the case in the form of our machine shown in Figs. 1 and 2. The upper of the parts in question is provided with a nut 150 with which the feed screw 142 is in threaded engagement and whereby the combined table is moved when the two parts thereof are secured together as in Figs. 1, 2 and 13, and whereby the upper only of said two parts is moved when said parts are not secured to gether.

The means for causing-the lower of the two parts 147 which together form the table to move in a direction 0 posite from the direction of movement 0 the upper part comprises an auxiliary feed screw 151 secured to the upfper end of the main feed screw 142, one 0 said screws having a right and the other a left hand thread. The auxiliary screw 151 is in threaded engagemerit with a nut 152, which nut is operatively connected with the lower of the two parts of the supporting table through rods 153, the upper ends of which rods are connected with said nut and the lower ends with lugs 154 at the upper end of said lower part, as illustrated.

The feed screw 142 is capable of being operated by a hand wheel 76, this hand wheel and the means whereby the feed screw is operated thereby being the same as has hereinbefore been described at length in describing the form of our invention illustmted in' Figs. 1 and 2. The reversing bar or rod 155 is also substantially the same in construction, and operates in the same way and through the same mechanism to reverse the direction of rotation of the feed screw 142 as the reversing bar hereinbefore described at length. The operatin lug 156 for the. bar, however, differs somew is provided with a segmental slot, as shown in Fig. 11, in order that the table support at from the lug 69 in that it.

. the screws 144 the table support may be moved upon the curved seat 141 and the table 147 tilted with reference to the tracer and cutter, as shown in dotted lines, Fig. 11, without in any way interfering with the feed mechanism which operates the table. This is a feature of importance in the practical operation of the machine, as it permits the pattern and die to be so adjusted and positioned relative to the tracer and cutter as to secure maximum convenience and efficiency in the operation of the machines; that is, permits an adjustment of the parts referred to such that a particular portion of the surface of the pattern which mi ht otherwise be inconvenient to get at wi be the better followed by the tracer than might be the case if'the surface of the table was at or substantially at right angles to the axes of the tracer and cutter, and permits an adjustment such that the cutter will operate to the best advantage as it cuts away the material of the die block, in the act of copying and reproducing the'portion of the surface in question in the die. It will also be'seen that upon removing the auxiliary feed screw 151 and nut 152, and securing the two parts of the table together as above explained and as shown in Fig. 18, the table becomes in efiect a unitary structure, and is moved up and down by the main feed screw 142, the same as in the form of our machine illustrated in Figs. 1 and 2, the rods 153 being left in place, as shown in -Fig. 13, if desired.

Having thus described and explained our invention, we claim and desire to secure by Letters Patent:

1. In an engraving machine of the class described, a suitable supporting frame; a slide and a table supported by said frame and movable transverse to one another; a swinging frame carried by said slide; a tracer and a cutter carried by said frame and adapted to engage a pattern and a die carried by said table; a feed screw for operatin saidslide; a. sprocket wheel operative y connected with said feed screw; a second sprocket wheel; a manually operable member 0 eratively connected with said second sproc et wheel; a sprocket chain connecting said two sprocket wheels; a second feed screw for operating said table; a manually operable member operatively connected with said table opera-ting feed screw; a

motor; and driving mechanism whereby said feed screws may be operated by said motor,

said driving mechanism including 'two 2. In an' eiigraving machine of the class described, a suitable supporting frame; a

slide and a table supported by said frame and movable at right angles to one another; a swingin frame carried by said slide; a tracer an a cutter carried by said frame and ada ted to en age a attern and a die carried by said ta la; a eed screw operatively connected with said slide; a sprocket wheel carried by said feed screw; means for locking said sprocket wheel and screw together so that the screw may be driven by thewheel; a second sprocket wheel; a hand wheel; means whereby said second sprocket wheel may be operated by said hand wheel; a sprocket chain connecting said sprocket wheels; a second feed screw operatively con nected with said table; a second hand wheel; means whereby said second feed screw may be operated by said second hand wheel; a motor; and driving mechanism throu h which said feed screws are operated by said motor, said mechanism including two clutches whereby each of said feed screws may be connected with or disconnected from said motor.

3. In an engraving machine of the class described, a suitable supporting frame; a

slide and a table'supported by said frame and movable at right angles to one another; a swingin frame carried by said slide; a tracer an a cutter carried by said frame and ads ted to en age a attern and a die carried y said ta la; a eed screw opera tively connected with said slide; a sprocket wheel carried by said feed screw; means for locking said sprocket wheel and screw together so that the screw may be driven by the wheel; a second sprocket wheel; a hand wheel; gearing intermediate said second sprocket wheel and said hand wheel, whereb" said second sprocket wheel may be 0 er 1. .ed by said hand wheel; a sprocket clihin connecting said sprocket wheels; a second feed screw operatively connected with said table; a second hand wheel; means whereby said second feed screw may be operated by said second hand wheel; a motor operatively connected with said second feed screw through a clutch whereby said motor may be disconnected from said screw; and means operated by said motor for intermittently operating said first mentioned feed screw.

In an engraving machine of the class described, a suitable supportin frame; guides carried by said frame; a side movable along said guides; means for moving said slide; a swinging frame carried by said slide; a tracer and a cutter carried by said frame and adapted to engage a pattern and a die; other guides arranged transversely to said first mentioned guides; a table made up of two parts movable along said last mentioned guides and which arts are adapted to support the pattern an the die aforenausea said; and means for movin the two parts of said table simultaneous y toward and from one another.

In an ,engravin machine of the class described, a suitab e supportin frame; guides carried by said frame; a s ide movable along said guides; a feed screw operatively connected with said slide; a swinging frame carried by said slide; atracer and a cutter carried by said frame and adapted to engage a pattern and a'die; other guides arraicged at right angles to said first mention guides; a table made up of two parts movable along said last mentioned guides and which parts are ada ted to support the pattern and the die a oresaid; a motor; means operated by said motor for im artin intermittent angular movement to said fee screw; and means operated by saidmotor for moving the two parts of said table simultaneously toward and from one another.

6. In an engraving machine of the class described, a suitable supportin frame; guides carried by said frame; a side movable along said guides; a feed screw operatively connected with said slide; a swinging frame carried by said slide; a tracer and a cutter carried by said frame and adapted to engage a pattern and a die; other guides arranged at right angles to said first men-v tioned guides; a table made up of two parts movable along said last mentioned guides and which parts are adapted to support the pattern and the die aforesaid, said parts eing movable simultaneously toward and from one another; a reversible motor; means operated by said motor for imparting intermittent angular movement to said feed screw; means operated by said motor for moving the two parts of said table alternately toward and from one another; and means operated by one of the parts of said table for reversing said motor.

In an engraving machine of the class described, a reciprocating and swinging frame; means for imparting reciprocating motion to said frame; a reciprocating table movable in a direction transverse to the direction of reciprocating movement of said frame, and which table is made up of two parts; means for moving the two parts of said table simultaneously toward and from one another; and a tracer and a cutter carried by said frame and adapted to engage a pattern and a die sup orted one upon each of the parts of said ta le.

In an engraving machine of the class described, a reciprocating supporting member; means for imparting tion to said sup ortin member; a swinging frame carried y sai reciprocatingJ member; a traces and a cutter carried y said frame and adapted to engage a pattern and a die; guides arran ed transverse to the path of travel of said reciprocating mem-' :r; a table made up of two parts movable .ong said guides and which parts are adaptl to support the pattern and the die afore- Lid; and means for moving the two parts f said table simultaneously toward and rom one another.

9. In an engraving machine ofthe class ascribed, a reciprocating supporting memer; a feedscrew operatively connected with aid member and adapted to impart recipocating motion thereto; a swinging frame arried by said reciprocating member; a racer and a cutter carried by said frame and idapted to engage a pattern and a die; guides arranged transverse to the path of -'ravel of said reciprocating member; a table made up of two parts movable along said guides and which parts are adapted to sup- )ort the pattern and the die aforesaid; a :econd feed screw operatively connected with me of the arts ofsaid table; means operated by sai second mentioned feed screw for a erating the other of the parts of said tab e; and means for operating said feed screws.

10.. In an engraving machine of the class described, a reciprocating supporting member; means for operating said member; a swinging frame carried by said reciprocatingmember; a tracer and a cutter carried by said frame and adapted to engage a pattern and a die; guides arranged transverse to the line of travel of said reciprocating member; a table made up of two parts movable along said guides and which parts are adapted to support the pattern and the die aforesaid; a feed screw in operative engagement with one of the parts of said table; a nut operatively connected with the other of said parts; an auxiliary feed screw operated by said first mentioned feed screw and in threaded engagement with said nut; and means for operating said first mentioned feed screw.

11. In an engraving machine of the class described, a reciprocating supporting member; means for operating said member; a swinging frame carried by said reciprocatingmember; a tracer and a cutter carried by said frame and adapted to engage a pattern and a die; guides arranged transverse to the path of movement of said reciprocating member; a table made up of two parts movable'along said guides and which arts are adapted to support the pattern an the die aforesaid; a feed screw in operative enga ment with one of the parts of said tab a nut operatively connected with the other of said arts; an auxiliary feed screw carried by said first mentioned feed screw and in threaded engage said feed and auxiliary screws being threaded oppositely; and means for operating said first mentioned feed screw.

12. In an engraving machine of the class ment with said nut,

described, a reciprocating supporting member; means for operating said member; a swinging frame carried by said rcciprm eating member a tracer and a cutter carried by said frame and adapted to engage a pattern and a die: a reciprocating table movable in a path trans\-'ersc to the path of movement of said reciprocating member and adapted to support the pattern and die aforesaid; means for operating said table; and means for tilting said table with reference to said tracer and cutter.

13. In an engraving machine of the class described, a reciprocating supporting member; means for operating said member; a swinging frame carried by said reciprocating member; a tracer an a cutter carried by said frame and adapted to engage a pattern and a die; an adjustable table support arranged transverse to the path of movement of said frame supporting member; a reciprocating table carried by said table support and ada ted to support the pattern and die aforesai and means for operating said table.

14. In an engraving machine of the class described, a reciprocating supporting member; means for operating said member; a swinging frame carried by said reciprocating member; a tracer an a cutter carried by said frame and adapted to engage a pattern and a die; an adjustable table support arranged transverse to the path of movement of said frame supporting member; a reciprocating table carried by said table support and adapted to support the pattern and die aforesaid; a feed screw carried by said table support and operatively connected with said table; and means for operating said feed screw.

15. In an engraving machine of the class described, a suitable supporting frame; guides carried by said frame; a slide movable along said guides; means for moving said slide; a swinging frame carried by said slide; a tracer and a cutter carried by said frame and ada ted to enga e a pattern and a die; a curve seat forme u on said supporting frame and the axis 0 curvature of which seat extends transverse to the path of movement of said slide; a table support having a curved surface adapted to contact with saidcurved seat; means whereby said table support may be adjusted upon said seat; a reciprocating table carried by said table support and ads ted to support the pattern I and die aforesai said table.

16. In an engraving machine of the class described, a suitable supportin frame; guides carried by said frame; a s ide movable along said guides; means for moving said slide; a swinging frame carried by said slide; a tracer and a cutter carried by said and means for operating frame and ada ted to engage a pattern and a die; a curve seat forme upon said supporting frame and the axis of curvature of which sent extends transverse to the path of movement of said slide; a table support having a curved surface adapted to contact with said curved seat; means. for securing said table support in place upon said seat; guides carried by said table support; a reciprocating table movable along said guides and adapted to support the pattern and die aforesaid; a feed screw also carried by said table support and operativcly connected with said table; and means for operating said feed screw.

17. In anengraving machine of the class described, a suitable supportin frame; guides carried by said frame; a side movable along said guides; a feed screw operatively connected with said slide; a swinging frame carried by said slide; a tracer and a cutter carried by said frame and adapted to engage a pattern and a die; a curved seat formed upon said supporting frame and the axis of curvature of which seat extends transverse to the path of movement of said slide; a table support having a curved surface adapted to contact with said curved seat; means for securing said table support in lace upon said seat; guides carrie, by sai table support; a reciprocating table movable along said guides and adapted to sup ort the pattern and die aforesaid; a fee screw also carried by said table support and operatively connected with said table; a. motor operatively connected with both said feed screws; means whereb said motor may be disconnected from sai feed screws; and two manually operable devices one operatively connected with each of said feed screws' and by means of Whichsaid slide and table may be operated independently of one another.

18. Irvan engraving machine of the class described, a reciprocating supportingmemher; a feed screw adapted tov operate said member; a swinging frame carried by said reciproca-tin member; a tracer and a cutter carried y said frame and adapted to en ge. a pattern and a die; a table support adyustable about an axis extending transverse to the path of travel of said supporting member; guides carried bysaid table sup ort; a reciprocating table movable along sai torn and die aforesaid; afee siting-said feed screws.

19. In an engraving machine of the class guides and adapted to SlifiPOl't the patscrew adapt-f ed to operate said table; and means for Operweight; and a flexible member between said weight and frame whereby said weight exerts a lifting action along the axis about which said framc'swings, and said pivots are relieved of the weight of said frame.

90. In an engraving machine of the class described, :1 suitable sup orting frame; horizontally extending gui es carried by said frame; a slide adapted to move along said guides; a frame carried by said slide and adapted to support a tracer and a cutter, and which frame is capable of a swinging movement about a vertical axis; two pivots whereby said frame is sup orted; a counterbalancing weight; and a exible member connecting sai weightand swinging frame and through which said weight exerts a liftin action along the axis about which sai frame swings, whereby said pivots are relieved of the weight of said frame.

21. In an engraving machine of the class described, a suitable supporting frame: guides carried by said frame; a slide movable along said guides; a. feed screw operatively connected with said slide; a swinging frame; two vertically arranged pivots whereby said swinging frame is supported from said slide so 'as to swing about a vertical axis; counterbalancing' means acting in a vertical direction and along the axis "about which said frame swings, whereby said ivots are relieved from the weight of said rame; a tracer and a cutter carried by said frame and adapted to enga e a. pattern and a die; other guides arranged transverse tosaid first mentioned guides; a table made up of two parts movable along said last mentioned guides, and which parts are adapted to support the pattern and the die aforesaid; and means for movin the two parts of said table simultaneou y toward and from one another.

22. In an engraving machine of the class described, a suitable supporting frame; guides carried by said frame; a slide movable along said guides; a feed screw operatively connected with said'slide; a swingmg frame; two vertically arranged pivots whereby slide so as to swing about a vertical axis' counterbalancin means acting in a vertical direction and :1 mg the axis about which said frame swings, whereby said pivots are relieved fromthe'weight of said frame; a

tracer and a cutter carried by said frame and adapted to engage a pattern and die;-

a table support adjustable about an axis extending transverse to the path of movement of said slide; guides carried by said table support; a tab e movable along said last mentioned guides and adapted to support the pattern and die aforesaid; a feed screw adapted to operate said table; and'means for operating said feed screws.

23. In an engraving machine of the clam :scribed a swingin frame; a removable eeve carried by sai frame; a rotarv cutr carrier carried by said sleeve and adapted 'support a cutter; a drivin pulley carried said frame and locate adjacent said eeve, which pulley is supported independitly of said sleeve and cutter carrier and operativcly connected with said rotary 'Jtter carrier; and means for driving said ulley.

24. In an engraving machine of the class ,escribed, a swinging frame; a removable leeve carried by said frame; a rotary cutter .arrier carried by said sleeve and adapted J sup ort a cutter; a driving pulley rotaable a out an axis correspondin wlth the axis of rotation of said cutter carrier; means or supporting said pulley from said frame ind independently of said sleeve and cutter :arrier; and driving means intermediate said )ulley and cutter carrier and throu h which aaid cutter carrier may be driven om said pulley;

25. In an engraving machine of the class described, a swinging frame; a removable sleeve carried by said frame; a rotary cutter carrier carried by said sleeve and adapted to support a cutter; a driving pulley rotatable about an axis corresponding with the axis of rotation of said cutter carrier and which pulley is in driving engagement with said carrier; and a bracket carried by said swinging frame and whereby said driving pulley is supported independently of said sleeve and cutter carrier.

26. In an engraving machine of the class described, a suitable supportin frame; guides carried by said frame a ide movable along said guides; a feed screw operatively connected with said slide; a swinging frame carried bysaid slide; a tracer and a cutter carried by said swinging frame and adapted to engage a pattern and a die; other guides arranged transverse to said first mentioned guides; a table movable along said last mentioned guides and adapted to support the pattern and die aforesaid; a second feed screw operatively connected with said table; means for operatin said feed screws; two manually operable eed devices one associated with each of said feed screws; and means controlled by the o erator of the machine and operate by t e o crating means for said feed screws for e ecting a swinging movement of saidswinging frame in such a way as to move said tracer and cutter away from the pattern and die.

27. In an engraving machine of the class described, a suitable supportin frame; guides carried by said frame; a side movable along. said guides; a feed screw operatively connected with said slide; a swinging frame carried by said slide; a tracer and a cutter carried by said swinging frame and adapted to engage a pattern and a die;

second feed screw adapted to operate said table; a friction pulley; means for rotating said pulley; a strap extending about said pulley; means for applying tension to said strap to thereby increase the friction between said strap andpulley; and means operuted by. said strap for effecting a swinging movement of said swinging frame in a direction to move said tracer and cutter away from the pattern and die.

28. In an engraving machine of the class 30 described, a suitable supporting frame; a slide and a table supported by said frame and movable in directions transverse to one another; a swinging frame carried by said slide; a tracer and a cutter carried by said 55 swinging frame; a weightoperatively connected with said swinging frame and adapted to hold said tracer and cutter in contact with said pattern and die; a spring tending to swing said frame in a direction to move said tracer and cutter away from said pattern and die; two feed screws one o eratively connected with. said slide an the other with said table; two manually operable feed devices one associated with each of said screws and b means of which said screws may be in ependently operated; a friction pulley; means for rotating said pulley; a strap extending about said ulley; means for applying tension to'said to-thereby increase the friction between said strap and ulley; and means operated by said strap or lifting the weight aforesaid to thereby permit said spring to act upon said swinging frame.

29. In an engraving machine of the class described, a suitable supporting frame; a slide and a table supported by said frame and movable in directions transverse to one another; a swinging frame carried by said slide; a tracer and a cutter carried by said swinging frame and adapted to engage a pattern and a die carried b said table; means for moving said sli e and table manually and independently of one another; means acting upon said swinging frame to press said tracer and cutter into contact with said pattern and die; and means controlled by the operator of the machine for moving said swinging frame in a direction to move said tracer and cutter away from the pattern and die.

30. In an engraving machine of the class described, a suitable supportin frame; guides carried by said frame a side movable along said guides; a feed screw operatively connected with said slide; a swingin frame; a tracer and a cutter carried by sai frame and adapted to engage a pattern and a die; other guides arranged transverse to strap said first mentioned guides; a table movable along said last mentioned guides and adapted to support the pattern and die aforesaid; a second feed screw operatively connected with said table; a motor for operating said feed screws; means whereby said motor may be disconnected from said feed screws; means for operating said feed screws manually and independently of one another; a weight operatively connected with said swinging frame and adapted to hold said tracer and cutter in contact with said pattern and die; a spring acting upon said frame and tending to move said tracer and cutter away from said pattern and die;

a rock shaft su ported from the frame of the machine; a notion pulley driven by the motor aforesaid; a drum loosely supported upon the shaft of said motor; a treadle; a strap with which said treadle is connected and which strap extends over said drum and about said friction pulley; means whereby said stra is operatively connected with said rock sha t' and means operated by said rock shaft for lifting said weight.

In testimony whereof we have signed our names to this specification this 24th day of August, 1915.

JOSEPH F. KELLER. WILLIAM A. WARMAN. 

